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Re: Miscellaneous'WorldPlot'
*To*: mathgroup at smc.vnet.net
*Subject*: [mg55910] Re: [mg55870] Miscellaneous'WorldPlot'
*From*: Bob Hanlon <hanlonr at cox.net>
*Date*: Sat, 9 Apr 2005 03:56:41 -0400 (EDT)
*Reply-to*: hanlonr at cox.net
*Sender*: owner-wri-mathgroup at wolfram.com
$Version
5.1 for Mac OS X (January 27, 2005)
Needs["Miscellaneous`WorldPlot`"];
It doesn't seem to like exact values. Force use of inexact numbers (e.g., I
used 2. vice 2)
WorldPlot[World,WorldRange->{{-90,90},{-90,90}},
WorldProjection->({
2.*Cos[#1*Pi/10800]*Sin[#2*Pi/10800]/
(1+Cos[#1*Pi/10800]*Cos[#2*Pi/10800]),
2.*Sin[#1*Pi/10800]/
(1+Cos[#1*Pi/10800]*Cos[#2*Pi/10800])}&)];
Bob Hanlon
>
> From: "Hanka Lakomá" <hana.lakoma at centrum.cz>
To: mathgroup at smc.vnet.net
> Date: 2005/04/08 Fri AM 01:36:53 EDT
> To: mathgroup at smc.vnet.net
> Subject: [mg55910] [mg55870] Miscellaneous'WorldPlot'
>
> Dear Group,
> I try to get a map in stereographic projection in transverse position (the
centre of the map is point 0°latitude, 0°longitude).
> I have cartographic equations of this projection in wanted position. So I put
them to WorldProjection:
>
> Miscellaneous'WorldPlot'
> WorldPlot [Europe,
> WorldRange->{{-90,90},{-90,90}},
> WorldProjection->({2*Cos[#1*Pi/10800]*Sin[#2*Pi/10800]/
> (1+Cos[#1*Pi/10800]*Cos[#2*Pi/10800]),
> 2*Sin[#1*Pi/10800]/
> (1+Cos[#1*Pi/10800]*Cos[#2*Pi/10800])}&)]
>
> and I get from Mathematica 4.2:
> WorldGraphics::"badproj" :
> The projection function {....,...} did not return a valid coordinate...
>
> If I change Europe for another possible continent or state it gives the same
type of error...
> If I change WorldRange for another possible it gives the same type of
error...
> Is a problem in projection function and Why? I know from cartography
textbooks that equations are correct...
> Any help would be appreciated.
> Thank you for your time and consideration.
> Hanka
>
>
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